Variable-speed driving mechanism.



R. STOOKBRIDGE.

VARIABLE SPEED DRIVING MECHANISM.

APPLICATION FILED APR.28. 1906.

Patented Dec. 27, 1910.

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1 r Em. t W ni 5 d n r TLLWI/ d U B R Witnesses To all whom it may concern: 7

Be it known that I, RADFORD STOOKBRIDGE,

. mechanism as chine on line burrs sra'rns PATENT OFFICE.

ARTHUR W. BEAT/IAN, OF WORCESTER,

MASSACHUSETTS.

VARIABLE-SPEED DRIVING MECHANISM.

' 13 by means of a stud 16. The eccentric a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Variable- Speed Driving Mechanism, of which the followingisa specification, accompanied by drawings forming a part of the same. and representlng my variable-speed applied to a metal-shaping machine,- in which Figure 1 represents a side view of a shaping machine embodying my invention. Fig. 2 represents a variable pitmanwith its actuating mechanism shown in central vertical sectional view, the section being taken through the portion of the sh'aping ma- 2-2, Fig. 1, and Fig. 3 is a detached and sectional view of the circular plate 10 and rotating gear 7.

Similar reference letters and figures refer to similar parts in the different views.

, 1 denotes the sup My present invention has for its object td increase the durability, rigidity, and accuracy of the operation of that class of variable speed mechanisms which form the'subject of the United States Patent No. 807,216 issued to me December 12, 1905, and tawhich reference may be had for a fuller description of the operatlve parts of the mechanism.

Referrmgto the accompanying drawings a, reciprocating ram3, having a head 4 .to

' carry the cutting tool, these parts being subbeen removed in the ring pivota stantially the same as in machines of this class now in 'common'use. Power is applied to a driving shaft5 by means of a cone pulley' attached to the shaft 5, but'which has accompanying drawings. Upon the inner end of the shaft 5Jis attached a pinion 6 which engages a gear 7 provided with a hub 8 which rotates upon' the outside of a fixed hub .9 which is integral with a'circular plate 10. The circular plate 10' is attached tothe framework of the. machine by bolts 11. P

Rigidlyiattached to the inside of the fixed hub 9 is an eccentric 12, having an eccentric 13 rotated around the fixed eccentric 12 by means of a sliding block 14, capable of a s idin motion in ways 15in the gear 7, and 1y connected with the eccentric ring orting framework provided at the top with horizontal ways 2 for Specification of Letters Patent: Patented Dec. 27, 1910. Application filed April 28, 1906.

Serial Ito/314,281.

ring carries a stud 17 upon which is pivot-' ally mounted a sliding block 18, capable of crank plate 20. The crank plate 20 is provided with along hub 21 which is .journaled a radial sliding movement in a slot 19 in a within the fixed hub 9. The crank plate 20 plate and extending variable pitman 28, pivoted at its lower end upon a stud 29 held in the framework of the machine, and provided at,its upper end with a friction roll 30 which engagesthe reciprocating ram 3.

The construction and operationjof the operativemechanism above described by, which a swinging motion is imparted to the variable pitman 28 is the same as that described sued tome December 12, 1905.

provided, on the side next the framework of the machine, with an annular flange 31, having its inner ca1ly .with its axis of rotation,

and the plate 10 is enlarged, in size so that its diameter is provided with an annular flange 32 having its outer surface finished concentrically with the axis of the fixed hub 9 to form a bearing for the flange 31. The edge 33'of the anface ofthe circular plate 10. The gear 7 is thereby provided with a bearing surface at ornear its periphery,- bothupon the side of the flange 31 to resist any longitudinal 31 and 32 which relievesthe journal bearing between the hub 8 of the gear and the fixed hub 9 of the framework, thereby Insuring, notwithstanding its continued use and wear, a true concentric bearing surface for the gear 7, thereby securingaccuracy of movement of the operative parts which obviates any cramping or binding of the same. but it inthe United States Patent No.'807,216, is-

By my present improvement the gear? is exceeds the diameter of the gear 7, and it,

nular flange 31 bears against the inner surthrust against-the gear wheel, but it also has a concentric bearing formed by the flanges I surface finished concentrialso decreases the friction and adds to the ease of operation and durability of the parts.

The circular plate 10 is provided also with a planesurface. at its periphery in contact with a plane surface on the framework, and the, plane surfaces are attached by the bolts 11. This insures the accurate adjustment of the plate 10 and, in combination with the concentric bearing surfaces upon the plate 10 and the gear 7, provides for the accurate relation of the gear T, eccentric 12 and its eccentric ring 13 and crank plate 20, and for their rotation withoutbinding or excessive friction. The plane surfaces upon the plate 10 and the framework are finished to be parallel and to provide an accurate fit, so that the correct position of the plate 10 and its attached parts is obtained with reference to the gear 7 and the rotating parts connected with it, and allcramping or binding is obviated.

I claim,

In a mechanism of the class described, a framework having an opening in its side,

.a circular plate attached to the framework,

and covering said opening, provided with a hollow hub and a concentric interior flange, a gear journaled on said hub and said concentric flange, a driving shaft passing through the edge of-said circular plate, and a pinion carried-on said shaft engaging said ear.

Dated this 21st day of April 1906.

' RADFORD STOCKBRIDGE.

\Vitnesses RUFUS B. FOWLER, PENELOPE COMBERBACH. 

